Attached images will not open.

Clicking an attached image in a JIRA ticket results in a spinner that never finishes spinning. The console in Chrome reports:

Uncaught Error: jira/fileviewer/module-backend/asynchronous missing ajs
main @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:9
callDep @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:9
req @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:9
window.require @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:12
(anonymous function) @ batch.js:1917
j @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:41
n.fireWith @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:42
(anonymous function) @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:524
(anonymous function) @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
Y @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
Z @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
F.resolve @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
Y @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
(anonymous function) @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
(anonymous function) @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
(anonymous function) @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
Y @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
Z @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
F.resolve @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
Y @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
Z @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
F.resolve @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
al @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
(anonymous function) @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:503
Y @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
Z @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
F.resolve @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497
(anonymous function) @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:503
n @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:503
aa @ batch.js?atlassian.aui.raphael.disabled=true&locale=en-US:497